Abstract
Pfahler P. L. In vitro germination and pollen tube growth of maize (Zea mays L.) pollen—VII. Effects of ultraviolet irradiation. Radiation Botany 13, 13–18, 1973.—Fresh, mature pollen grains (mean diameter = 88·0 ± 0·5 μ) of the inbred H55 were exposed to irradiation from 0 to 29·7 × 10 5 erg/cm 2 at 2·7 × 10 5 erg/cm 2 intervals using an apparatus that exposed the pollen grains to irradiation from all directions. After irradiation, pollen grains from each exposure were cultured on an artificial medium containing 15% sucrose, 0·6% bacto-agar, 0·03% calcium nitrate and 0·01% boric acid. Germination ranged from 82·5 per cent at 0 exposure to 0·0 per cent at 29·7 × 10 5 erg/cm 2. A significant decrease in germination was obtained with each increase in exposure indicating a negative linear relationship. The LD 50 value was 15·0 × 10 5 erg/cm 2. The ruptured grain per cent ranged from 5·6 at 0 exposure to 18·6 at 29·7 × 10 5 erg/cm 2. No significant differences were obtained in ruptured grain per cent between 0 and 18·9 × 10 5 erg/cm 2. However, each increase in exposure above 18·9=10 5 erg/cm 2 resulted in a significant increase. A negative relationship between exposure and pollen tube length was found at 1, 2 and 3 hr after inoculation. However, the depression in pollen tube length at each interval after inoculation was much more pronounced at lower than at higher exposures.
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